BTWB vs PRzilla: which tracker fits how you train

We make PRzilla. Every factual claim about BTWB below — features, pricing, scale — is a quotation from their own public pages. Where I describe what using it is like, that is my own experience as someone who has tried most of the trackers in this sport, and you should weigh it as one person's opinion.

I want to be straight about where BTWB sits. Of the roughly two dozen CrossFit apps I have looked at, it is the one I would call the standard. It logs individual movements properly, it does not lock you to an affiliate, and it has been doing serious analytics since long before most of the current crop existed. It earned that position.

Four things work differently in PRzilla, and most of them follow from how BTWB is built rather than from anything it overlooked.

What BTWB does well

Their leverage is scale. Workout planning runs on "over 100 million btwb results", and that shows up everywhere in the product. Fitness Level is "a rating from 1 to 100 that provides a non-biased view of their capabilities", assessed "across 8 categories". You can "Race Against Popular Results" — pull other athletes' scores into your workout and use them as pacers.

Heart rate is genuinely ahead of us: BTWB tracks it "across individual movements, rounds, and the entire workout". PRzilla ingests nothing that granular, and if per-movement heart rate is what you want, that is a real reason to stay.

They also carry affiliate programming from Mayhem, PRVN, and Linchpin, and individual athletes can use it without a gym. It runs $9.99 a month or $99 a year, after a 30-day trial.

1. A target for a workout nobody has ever logged

This is the one difference that is structural rather than incidental.

A hundred million results is a genuine advantage for ranking you on Fran. It cannot help with the workout your coach wrote on the whiteboard this morning, because that workout has been logged zero times. Population data can only price what the population has already done.

PRzilla generates the level bands instead of looking them up. Paste in a workout, tap Calculate levels, and the parser reads it and predicts what athletes at each ability level would record. It is one deliberate tap rather than automatic — generating a ladder costs a model call, so we ask rather than assume — but it is available on any workout, including one written this morning that nobody has ever logged. In practice that covers the long tail: of 7,235 custom workouts in our database — one-off sessions written by coaches and athletes, existing nowhere else — 6,033 carry a full L1 to L10 ladder.

That prediction is not one call to a general-purpose model and a shrug. The benchmark prompt is on its fifth generation with 20 recorded evaluation runs behind it, and it is written as a coaching task rather than a maths task — the model is told it is scoring an existing workout by predicting what athletes at each ability level would record, not designing one. Raw output then passes through a calibration pass that carries its own evidence for time caps, loads, and plausible score windows. Ten hand-verified classics — Fran, Grace, Helen and the rest — are never edited by that process, because they anchor the eval that grades everything else.

It is still a prediction, and predictions go wrong. When we audited the ladders in July we corrected 30 of them, including a Diane that asked for 4:30 at the top level when real elite times are nearer 2:00. We published what we found, because a generated number you cannot inspect is not worth much.

So the trade is real and worth naming. Their number is what people actually did, and that is better evidence than a prediction wherever it exists. Ours exists everywhere, and we audit it.

2. Advice that knows what you did on Tuesday

Both apps read wearables. The difference is what happens to the reading.

PRzilla's coach gets sleep duration, sleeping heart rate, and how recent those readings are, alongside the pattern of your recent training with your most-loaded body parts ranked first. So if you squatted heavy on Tuesday and racked up volume on Wednesday, Thursday's suggestion is not the same suggestion someone who walked in fresh would get. It will tell you to bring the intensity down.

That is a smaller claim than "we use your wearable data" and a more useful one. Anybody can display a recovery number. The question is whether today's target moves because of it.

3. A number you can take apart

PRzilla's Fitness Level is built from a method we have published in full. It takes your eligible Rx benchmark results, weights recent ones more heavily once you have three, drops your single lowest adjusted result once you have five, and applies difficulty and profile adjustments after that. Every rule is written down, and the screen shows you your strongest graded results and the level each one earned.

It is also built to be hard to inflate. Scaled results, unknown-Rx results, and custom workouts are deliberately excluded, so the number rises when you get fitter rather than when you log more. That restraint is what makes it worth checking instead of just watching.

We are not finished here. The screen shows your best results per workout, not the exact recent set that produced today's number, and I want a full contribution breakdown — which results counted, what weight each carried, which one got dropped. A number you can interrogate is a number you can train against, and that is the standard we are building toward rather than one we have already met.

4. One athlete, not a whole gym

BTWB's own headline is "Your All-In-One Gym Management System that Puts Fitness First." They call it "The Premier All-In-One Platform" and describe the scope plainly: "Whether it's planning workouts, managing membership options, class schedules or your billing, we have it covered."

That is not marketing filler, it is an accurate description. The product handles class scheduling, membership billing, digital waivers, and financial reporting alongside the training log. The athlete app is one surface of a system that also has to serve the person who owns the building.

Breadth like that has a cost, and the cost is not a design failure — it is arithmetic. A platform serving owners, coaches, and athletes accumulates options, because every one of those people needs something the others do not. Years of serving all three is how you end up answering several questions before you can write down that you did some snatches.

PRzilla has one user: you. Nobody bills anyone through it, no waivers, no class roster. That constraint is the feature. It means we can decide what today's screen is for instead of making it configurable, and it is why logging a session takes the number of taps it takes.

The presentation we aim for is closer to a recovery wearable than to a workout database: open it, and the point should be legible in a second, without interpreting a dashboard to find it. The one thing we take from that model is the clarity, not the mystery — where a wearable hands you a score and asks for trust, ours shows the results underneath it.

Which one fits

BTWB is the right call if the classics are most of what you log, you want per-movement heart rate, or your gym runs its scheduling and billing through it and you want everything in one place. That is what a hundred million logged results and an all-in-one platform buy.

PRzilla is the right call if most of what you train was written this morning. Your coach's programming, your own sessions, a home gym workout you made up — all of it can be graded to the same L1–L10 standard as Fran, one tap away, on a workout nobody has logged before. Add advice that accounts for the week you have actually had, and a fitness number built on rules you can read, and you have a training record that works for the way most people at a box actually train.

The honest summary

BTWB is better at the known. PRzilla is built for the unknown — the workout that has never been logged, graded on request the day it is written. Which one matters depends on what fraction of your training is on the whiteboard versus in the canon.

For most people at a box following daily programming, that fraction is higher than they think.